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@LJWsao
Description
Overview
When sent a GET request with an empty host header, WEBrick responds with error code 500, but it should respond with Error Code 400, for an invalid request.
Reproducing the Bug
- Clone, build, and install WEBrick. (Tested on ea12400)
- Set up a
config.rufile with the following contents:
class Server def call(env) [200, {}, []] end end run Server.new
- Run
rackup. - Send a GET request with an empty host header, and observe WEBrick's response as follows:
printf 'GET / HTTP/1.1\r\nHost: \r\n\r\n' | ncat localhost 9292
Rack::Lint::LintError: env missing required key SERVER_NAME (Rack::Lint::LintError)
/usr/share/rubygems-integration/all/gems/rack-3.1.16/lib/rack/lint.rb:283:in `block in check_environment'
/usr/share/rubygems-integration/all/gems/rack-3.1.16/lib/rack/lint.rb:282:in `each'
/usr/share/rubygems-integration/all/gems/rack-3.1.16/lib/rack/lint.rb:282:in `check_environment'
/usr/share/rubygems-integration/all/gems/rack-3.1.16/lib/rack/lint.rb:63:in `response'
/usr/share/rubygems-integration/all/gems/rack-3.1.16/lib/rack/lint.rb:41:in `call'
/usr/share/rubygems-integration/all/gems/rack-3.1.16/lib/rack/show_exceptions.rb:31:in `call'
/usr/share/rubygems-integration/all/gems/rack-3.1.16/lib/rack/common_logger.rb:43:in `call'
/usr/share/rubygems-integration/all/gems/rack-3.1.16/lib/rack/content_length.rb:20:in `call'
/usr/share/rubygems-integration/all/gems/rackup-2.1.0/lib/rackup/handler/webrick.rb:111:in `service'
/var/lib/gems/3.3.0/gems/webrick-1.9.1/lib/webrick/httpserver.rb:140:in `service'
/var/lib/gems/3.3.0/gems/webrick-1.9.1/lib/webrick/httpserver.rb:96:in `run'
/var/lib/gems/3.3.0/gems/webrick-1.9.1/lib/webrick/server.rb:310:in `block in start_thread'
::1 - - [27/Aug/2025:18:40:52 +0000] "GET / HTTP/1.1" 500 1183 0.0002
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